PERFORMANCE OF METHANOL EXTRACT OF Kalanchoe crenata LEAVES ON CORROSION OF MILD STEEL IN 5.0 M ACID MEDIUM.

The inhibitive performance of the methanol extract an eco-friendly green inhibitor Kalanchoe crenata (KC) leaves on corrosion mild steel in 5.0 M H2SO4 solution with concentrations 1 g/L, 2 3 4 g/L and 5 at temperatures 333 K 353 was studied using gravimetric (weight loss) gasometric (hydrogen evolution) techniques to determine its inhibition efficiencies as well depict mechanism inhibitor. technique done for Hours. Results indicate that leaf inhibited process efficiently. showed efficiency 84.95% 84.24% (333 K) analysis respectively. Inhibition found increase concentration also increased time but decreased temperature. Thermodynamic considerations revealed activation energy, Ea presence plant extract. kinetic data confirmed reaction be first order. Adsorption surface is exothermic spontaneous deduced by negative Qads mean value (-10.39 kJ/mol) ∆Gads values (-11.54 -10.49 kJ/mol). adsorption proposed physical adsorption. Experimental obtained fits Langmuir isotherm.